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By sooty I have to assume you mean black.
That condition is an indication of the incomplete combustion of some Hydrocarbon [fuel or crankcase oil] which did not fully burn in the cylinder (s).
There could be many causes for this, only a couple of which come to mind at the moment:
- Fuel mixture is too rich [too much fuel in relation to the amount of air].
- Crankcase lubricating oil is getting into the cylinder (s). This could be caused by badly worn valve-stem guides, or worn-out or broken oil rings on the piston (s).
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∙ 14y ago
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Black soot isn't a good sign, one of ur plugs or plug wires must have burnt up. and should be replaced.
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